Mathematics 53 Astronomy 39 Physics 29 SCIENCE 27 Astronomy, Cosmology and Space Sciences 25 Differential equations 23 Differential Equations 22 Applications of Mathematics 20 Life Sciences 20 Mathematical physics 19 Mechanics 19 Analysis 18 Astronomy, Observations and Techniques 18 Astronomy-Observations 18 Astrophysics 16 Mathematical analysis 16 Statistics  16 History 15 Life sciences 15 Social sciences 15 Engineering 14 Mathematics-Data processing 14 Science 14 Technology and Engineering 14 Humanities 13 Humanities and Social Sciences 13 Physics and Astronomy 13 Classical Mechanics 12 Computational Mathematics and Numerical Analysis 12 Geometry 12